tracing: Fix subbuf resize races with trace_pipe_raw readers

{
  "id": "e6eb0744f6d7a716394df4b23825f3b44f6e2d0d71770c126a05d5aafb96fbba",
  "url": "https://osv.dev/vulnerability/CVE-2026-98032",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tracing: Fix subbuf resize races with trace_pipe_raw readers",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: tracing: Fix subbuf resize races with trace_pipe_raw readers Concurrent subbuffer resizes may crash trace_pipe_raw readers or leak uninitialized memory to userspace due to stale size values. Modify ring_buffer_alloc_read_page() to handle the resizing of an existing buffer_data_read_page if necessary and add a new ring_buffer_read_page_size(). This new function enables ring-buffer buffer_data_read_page users to not call the racy ring_buffer_subbuf_size_get(). This makes the spare_size member of ftrace_buffer_info redundant. Finally, handle buffer_data_read_page/reader_page order discrepancy in ring_buffer_read_page(). On a mismatch simply copy manually the data to the buffer_data_read_page.",
    "evidence": "osv:CVE-2026-98032",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.114",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.57",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98032",
      "aliases": [
        "CVE-2026-98032"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "bce761d757452ba5eb77e11fecc37a04b67494e7"
                },
                {
                  "fixed": "574efd988d116bd56ac688ab2d64e06ba0da982a"
                },
                {
                  "fixed": "3f30b2cd4eba45c05f822f03f1b0f4077d6d4dc3"
                },
                {
                  "fixed": "75b37b8369778b69ce9738d1c97685a1615cb252"
                },
                {
                  "fixed": "dae8dda341d2d9034a90d59e8a7d502e1263813f"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98032.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.8.0"
                },
                {
                  "fixed": "6.12.114"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.57"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98032.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.954566895Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3f30b2cd4eba45c05f822f03f1b0f4077d6d4dc3",
        "https://git.kernel.org/stable/c/574efd988d116bd56ac688ab2d64e06ba0da982a",
        "https://git.kernel.org/stable/c/75b37b8369778b69ce9738d1c97685a1615cb252",
        "https://git.kernel.org/stable/c/dae8dda341d2d9034a90d59e8a7d502e1263813f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98032.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98032",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98032.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98032",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 519561,
  "published_at": "2026-09-25T10:23:48.169+00:00"
}